#include <bits/stdc++.h>
#define NMAX 5004
#define GMAX 10002
using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, G;
int g[NMAX];
int c[NMAX];
int cmax[GMAX];
void citire();
void pd();
int main()
{
    citire();
    pd();
    fout <<cmax[G]<<'\n';
    fout.close();
    return 0;
}
void citire()
{
    int i;
    fin >>n>>G;
    for (i=1;i<=n;i++) fin >>g[i]>> c[i];
}
void pd()
{
    int i,x;
    for (i=1;i<=n;i++)
        for (x=G;x>0;x--)
        if (x>=g[i])
        if (cmax[x]<c[i]+cmax[x-g[i]])
    {
        cmax[x]=c[i]+cmax[x-g[i]];
    }
}